Audio mixer



FIG. 1 is a top, front perspective view of the audio mixer according to the present invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines are used to show environmental structure only, and form no part of the claimed design. 

The ornamental design for an audio mixer, as shown and described. 